Interesting… I had heard rumors of the Oort planet, but none in such a recent article (really old articles usually means the news turned out to be a dud and fell out of interest). Here's an orbital image for comparison.

The purple circle is Pluto's orbit, Sedna's closest approach is 74 AUs, it's furthest is 960 AUs. This supposed planet is (according to the article) at 15000 AUs… To put things even more into perspective, a lightyear is around 63200 AU.